| (19) |
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(11) |
EP 0 033 953 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
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12.05.1982 Bulletin 1982/19 |
| (43) |
Date of publication A2: |
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19.08.1981 Bulletin 1981/33 |
| (22) |
Date of filing: 05.02.1981 |
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| (84) |
Designated Contracting States: |
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AT BE DE FR IT |
| (30) |
Priority: |
06.02.1980 US 118893
|
| (71) |
Applicant: PHILLIPS PETROLEUM COMPANY |
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() |
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| |
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| (54) |
Process for producing a catalyst, catalyst and use of the catalyst |
(57) In accordance with one embodiment of this invention, a silica hydrogel is prepared
and dried in the presence of a pore preserving agent after which a titanium compound
is anhydrously incorporated therewith. In accordance with the second ambodiment of
this invention, a silica hydrogel or a silica xerogel is impregnated with an aqueous
organic acid solution of a substituted or unsubstituted titanium acetylacetonate.
The invention allows the use of conventional drying to produce a silica exhibiting
characteristics associated with azeotrope dried titanium-silica for use as a support
for chromium catalysts. The resulting catalysts are broadly applicable in the polymerization
of olefins and are of particular utility in the slurry polymerization of olefins,
particularly predominantly ethylene monomer.